If I'm stuck, yes. I'm the kind of person that, if I don't "get it" in the first few minutes, it's just not going to happen. This is backed up by the fact that when I do look at the solution in the walkthrough, it is pretty much always something I never would have thought of and makes little sense to me. So I don't waste hours thinking about what to do because it's not going to solve anything, it will just get me frustrated.
If I'm playing a game I don't care about that much, I am more likely to go to the walkthrough. Games are supposed to be fun, not anger-inducing because you have spent half an hour trying to figure out where one item is.